[lvm-devel] [PATCH 13/14] Add lvm_lv_get_property() generic function to obtain value of any lv property.
Dave Wysochanski
dwysocha at redhat.com
Mon Oct 11 15:14:37 UTC 2010
Signed-off-by: Dave Wysochanski <dwysocha at redhat.com>
---
lib/report/properties.c | 6 ++++++
lib/report/properties.h | 2 ++
liblvm/lvm2app.h | 26 ++++++++++++++++++++++++++
liblvm/lvm_lv.c | 18 ++++++++++++++++++
4 files changed, 52 insertions(+), 0 deletions(-)
diff --git a/lib/report/properties.c b/lib/report/properties.c
index 250c7c9..56372da 100644
--- a/lib/report/properties.c
+++ b/lib/report/properties.c
@@ -267,6 +267,12 @@ static int _get_property(const void *obj, struct lvm_property_type *prop,
return 1;
}
+int lv_get_property(const struct logical_volume *lv,
+ struct lvm_property_type *prop)
+{
+ return _get_property(lv, prop, LVS);
+}
+
int vg_get_property(const struct volume_group *vg,
struct lvm_property_type *prop)
{
diff --git a/lib/report/properties.h b/lib/report/properties.h
index 7398f2f..5956604 100644
--- a/lib/report/properties.h
+++ b/lib/report/properties.h
@@ -34,6 +34,8 @@ struct lvm_property_type {
int (*set) (void *obj, struct lvm_property_type *prop);
};
+int lv_get_property(const struct logical_volume *lv,
+ struct lvm_property_type *prop);
int vg_get_property(const struct volume_group *vg,
struct lvm_property_type *prop);
int pv_get_property(const struct physical_volume *pv,
diff --git a/liblvm/lvm2app.h b/liblvm/lvm2app.h
index b6cc729..126700a 100644
--- a/liblvm/lvm2app.h
+++ b/liblvm/lvm2app.h
@@ -1012,6 +1012,32 @@ const char *lvm_lv_get_name(const lv_t lv);
uint64_t lvm_lv_get_size(const lv_t lv);
/**
+ * Get the value of a LV property
+ *
+ * \memberof pv_t
+ *
+ * The memory allocated for a string property value is tied to the vg_t
+ * handle and will be released when lvm_vg_close() is called.
+ *
+ * Example:
+ * lvm_property_value value;
+ *
+ * if (lvm_lv_get_property(pv, "seg_count", &value) < 0) {
+ * // handle error
+ * }
+ * if (value.is_string)
+ * printf(", value = %s\n", value.u.s_val);
+ * else
+ * printf(", value = %"PRIu64"\n", value.u.n_val);
+ *
+ *
+ * \return
+ * 0 (success) or -1 (failure).
+ */
+int lvm_lv_get_property(const lv_t lv, const char *name,
+ struct lvm_property_value *value);
+
+/**
* Get the current activation state of a logical volume.
*
* \memberof lv_t
diff --git a/liblvm/lvm_lv.c b/liblvm/lvm_lv.c
index 7bdafe0..76e8691 100644
--- a/liblvm/lvm_lv.c
+++ b/liblvm/lvm_lv.c
@@ -21,6 +21,7 @@
#include "locking.h"
#include "activate.h"
#include "lvm_misc.h"
+#include "properties.h"
static int _lv_check_handle(const lv_t lv, const int vg_writeable)
{
@@ -48,6 +49,23 @@ const char *lvm_lv_get_name(const lv_t lv)
NAME_LEN+1);
}
+int lvm_lv_get_property(const lv_t lv, const char *name,
+ struct lvm_property_value *value)
+{
+ struct lvm_property_type prop;
+
+ strncpy(prop.id, name, LVM_PROPERTY_NAME_LEN);
+ if (!lv_get_property(lv, &prop))
+ return -1;
+ value->is_writeable = prop.is_writeable;
+ value->is_string = prop.is_string;
+ if (value->is_string)
+ value->v.s_val = prop.v.s_val;
+ else
+ value->v.n_val = prop.v.n_val;
+ return 0;
+}
+
uint64_t lvm_lv_is_active(const lv_t lv)
{
struct lvinfo info;
--
1.7.2.2
More information about the lvm-devel
mailing list